"Nightline" received a call Tuesday from a man who identified himself as Ron Hennes. Hennes said he was the nurse caring for the patient in question at the time of his death. He said he had never worked for Alcor, and that the patient's death occurred in the man's bedroom with only Hennes and the patient's partner present at the bedside.

He told "Nightline" that nobody injected the patient with anything that hastened his death.

But Alcor's CEO at the time, Carlos Mondragon, told ABC News that the allegation that the patient's death was hastened was brought directly to him, and that his response was to cut Alcor's ties with the employee accused of administering the injection.

Ted Williams, Alcor Member A-1949

Johnson also set out to reconstruct the story of Alcor's most famous frozen resident -- and Johnson's admitted childhood hero -- Ted Williams. By the time Johnson began work at Alcor, "Teddy Ballgame" had been on ice for half a year.

"They put his head into a vessel called the Cryo-star, which is really not meant for freezing human heads, OK? It was faulty, they didn't know how to use it ... it was having very dramatic temperature swings."

Johnson said Williams' head remained in a malfunctioning machine for more than a year, and claimed he recorded this conversation about the Cryo-star:

Alcor official: ... We're not actually supposed to use that to put any human heads in it because they never really had time to test it very much.

Johnson: Right.

Alcor official: We're supposed to be doing some testing on it.

In one of the most potent allegations in Johnson's book, he said Alcor cut off Williams' head without prior approval from his family.

"He was supposed to be a whole-body suspension," Johnson said. "He was supposed to be in one piece. They got him to the O.R. at Alcor and proceeded to cut through his neck."

But, in this instance at least, Johnson's version seemed to be incorrect. ABC News found notarized agreements, signed by Williams' oldest son and youngest daughter allowing Alcor the option of removing their father's head. The papers were signed in Florida just after 9 p.m. ET -- at least an hour before the operation began in Arizona, according to the log Johnson cites in his book.

Johnson said he was going by what he had been told.

In a statement posted to its Web site, Alcor says: "Ted Williams was cryopreserved with the care and scientific rigor that Alcor devotes to all its patients," and that "it is absurd for Johnson to make these allegations because he had yet to be hired when Williams was cryopreserved."

But Johnson said he was there in July of 2003 when Alcor determined it was time to move William's head into its permanent home.

"They put him in another vessel called the LR-40. ... They take a tuna can, a Bumble Bee tuna can, they set it down on the bottom of the LR-40. ... They put his head into the LR-40, set it on the tuna can. Without that tuna can, the head would just topple over."

The next day, Johnson said, he watched in horror as an Alcor employee moved the head into the silver pot that would store it for years to come.